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X x 6 + X x 4 =120
X x(6+4)=120
X x 10 = 120
X = 120:10
X = 12
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(x+2)+(x+4)+(x+6)+(x+8)+x=120
( x + x + x + x + x ) + ( 2 + 4 + 6 + 8 ) = 120
5x + 20 = 120
5x = 120 - 20
5x = 100
x = 100 : 5
x = 20
(x+2)+(x+4)+(x+6)+(x+8)+x=120
120=5x+(2+4+6+8)
120=5x+20
=>5x=120-20
=>5x=100
=>x=100:5
=>x=20
vậy x=20.
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120 x 64 + 320 - 25 x 4 x 16
= ( 120 x 64) + 320 - (25 x 4 x 16)
= 7680 + 320 - ( 100 x 16 )
= 8000 - 1600
= 6400
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a) 86*(121-120+9)==86*10=860
b)136*(75+19+6)=136*100=13600
Mk giải r đó nha chắc chắn đúng
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a) 298 x 47 - 298 x 27
= 298 x ( 47 - 27 )
= 298 x 20
= 5960
b) 954 + 954 x 147 - 954 x 47
= 954 x ( 147 - 47 )
= 954 x 100
= 95400
c) 120 : 5 + 380 : 5
= ( 120 + 380 ) : 5
= 400 : 5
= 80
d) ( 125 x 48 ) : 6
= 6000 : 6
= 1000
a) 298 x 47 - 298 x 27.
= 298 x (47 - 27).
= 298 x 20 = 5960.
b) 954 + 954 x 147 - 954 x 48.
= 954 x (1 + 147 - 48).
= 954 x (148 - 48).
= 954 x 100 = 95400.
c) 120: 5 + 380 : 5.
= (120 + 380) : 5.
= 500 : 5 = 100.
d) (125 x 48 ): 6
= (125 x 6 x 8) : 6.
= 125 x 8.
= 25 x 5 x 8.
= 25 x 40 = 1000.
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(x + 1) + (x + 3) + (x + 5) = 120
x = 120 - ( 5 + 3 + 1) : 3
x = 111 : 3
x = 37